Nut-lock.



':No.847,641. I PATENTED MAR. 19,1907. L. BOUDREAUX.

- NUT LOCK.

APPLIOATION FILED 1330.20, 1906.

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INVENTOR A TTORNE Y5 ms NoRRIs PETERS co, wnsnmam c.

PATENT OFFICE.

LEANDRE BOUDREAUX, OF THIBODAUX, LOUISIANA.

NUT-LOCK.

Specification of Letters Patent.

Patented March 19, 1907'.

Application filed December 20.1906. Serial No. 348.795.

T aZZ whont it may concern:

Be it known that I, LEANDRE BOUDREAUX, a citizen of the United States,residing at Thibodaux, in the parish of Lafourche and State ofLouisiana, have invented a new and useful N ut-Lock, of which thefollowing is a specification.

This invention has relation to nut-locks; and it consists in the novelconstruction and arrangement of its parts, as hereinafter shown anddescribed.

The object of the invention is to provide an absolutely positive meansfor retaining a nut upon a bolt. The means consist, primarily, inproviding the threaded portion of the bolt with a reduced neck. The nutis adapted to be screwed upon the thread of the bolt until it passesbeyond said reduced neck. A plate having a thread especially arrangedtherein is screwed upon the bolt behind the nut. The perforation of thesaid plate is provided with a recess which when the said plate arrivesover the reduced neck of the bolt permits the said plate to fall and thesaid recess will receive the reduced neck of the bolt. The nut may thenbe screwed back slightly, so as to bind the said plate against thelarger end portion of the bolt. By reason of the fact that the saidplate falls into the space about the reduced neck the center of gravityof the said plate is carried below the longitudinal axis of the bolt.Consequently attraction by gravity will in a great measure tend to keepthe said plate in proper position and hold the same against upwardjarring or vibration. Furthermore, the thread is so out in the saidplate that the heavier portion of the plate must pass over the upperside of the bolt before the thread of the plate will engage with thethread of the bolt, all of which goes to reduce the possibility of thesaid plate engaging the thread of the bolt and unscrewing therefrom, andthus making it possible for the nut to work loose.

In the accompanying drawing, Figure 1 is a side elevation of a bolt withthe nut and plate in vertical section. Fig. 2 is a vertical sectionalview of the plate cut on the line 2 2 of Fig. 4 and looking in thedirection indicated by the arrows adjacent said lines. Fig. 3 is avertical sectional view of the plate cut on the line 3 3 of Fig. 4 andlooking in the direction indicated by the arrows adjacent said line, andFig. 4 is a side elevation of the plate.

The bolt 1 is provided at a point interme Said plate reason of the factthat the said'plate 5 is provided with a recess 7 the center of gravityof the said plate will be toward the opposite side thereof. Consequentlywhen the plate 5 is within the space about the reduced neck 2 the centerof gravity of the said plate 5 will be below the longitudinal axis ofthe bolt 1. Consequently the plate 5 would have to be subjected toconsiderable jar or vibration in order that it may be elevatedsufiiciently with relation to the bolt 1 that its thread may becomeenmeshed with the thread 4 that the said plate may unscrew from thebolt. The nut 3 is screwed on the bolt in advance of the plate 5, andwhen the plate 5 is seated about the reduced neck 2, as above described,the nut 3 may be screwed back against the said plate 5 in order to bindthe same. Furthermore, the thread in the plate 5 begins at the point 8and terminates at the point 9 (it is of course interrupted by the recess7.) As the points 8 and 9 are adjacent the edges of the recess 7 thelower Weightier portion of the said plate must become inverted withrelation to the upper recessed portion before the thread of the platemay engage the thread of the bolt, all of which goes to reduce thepossibility of the ]said plate from unscrewing from the said olt.

In some instances where it is imperative that provision be made for theabsolute impossibility of the nut to unscrew from the olt a cotter-pin10 (see Fig. 1) is passed transversely through the weightier portion ofthe plate 5 after the parts are assembled. The head of the said pin,which rojects beyond the edge of the nut 3, will absolutely prevent thesaid plate from moving upward with relation to the said nut.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

A nut-lock comprising a bolt having its threaded portions provided witha'reduced In testimony that I claim the foregoing as neck, a platehaving a threaded perforation my own I have hereto aflixed my signatureand ada ted'to screw upon the bolt, said inthe presence of'twoWitnesses.

threade perforation having a recess adapted LEANDRE BOUDREAUXY. 5 toreceive the side of the reduced neck of the Witnesses:

bolt when the thread of the perforation dis"- J. LOUIS ANGAM.

engages the thread of the bolt. L. V. AZEMAR.

